| http://www.w3.org/ns/prov#value | - ymethyl siloxane. 2. in a battery comprising at least one electrolytic cell, said cell including an anode and a cathode disposed in electrolyte, said anode and cathode separated in said electrolyte by a battery separator the improvement comprising the battery separator, said separator comprising a hydrophobic, microporus, polymeric film characterized by a reduced bulk density compared to the bulk
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